Endpoint-based call admission control and resource management for VoWLAN

Philip McGovern, Philip Perry, Sean Murphy, Liam Murphy

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This paper examines two specific aspects of resource management in Wireless Local Area Networks (WLANs)—Call Admission Control (CAC) and handling of Link Adaptation (LA) events. A self-consistent system to manage these for Voice over Internet Protocol (VoIP) over an IEEE 802.11 WLAN is presented. The proposed CAC scheme is based on the Endpoint Admission Control (EAC) paradigm, where the endpoints probe the network to determine if the call can be supported with acceptable Quality of Service (QoS). The proposed scheme was evaluated on an experimental testbed and test results show that correct admission decisions were made under various network configurations. The scheme also determines if LA has resulted in the system becoming congested and, if so, the voice codec of the handset which has undergone LA is adapted so as to restore the system to its earlier state, thereby alleviating the congestion. The proposed scheme was evaluated on the experimental testbed and test results show that the codec adaptation scheme was very effective at overcoming the effects of LA for VoIP over WLAN.

Original languageEnglish
Article number5620918
Pages (from-to)684-699
Number of pages16
JournalIEEE Transactions on Mobile Computing
Volume10
Issue number5
Early online date9 Nov 2010
DOIs
Publication statusPublished - 1 May 2011

Keywords

  • Call admission control
  • IEEE 802.11
  • link adaptation
  • VoIP.

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